腹足纲，中腹足目，马蹄螺科，别名马蹄钟螺、公螺。见于我国西沙群岛、南沙群岛，日本、印度支那半岛也有分布。生活于低潮线至浅海的珊瑚礁岩石上。肉可食用。
学名：Trochus niloticus
英文名：Big horseshoe conch
This species belongs to the family of Trochidae,order of Mesogastropoda. Distribution in Chinese Xisha Islands, Nansha Islands, Japan and Indochina Peninsula It lives at low tide or the coral reef rocks of shallow seas.It is a kind of edible conch.